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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2013. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/07081312187
Reservoir characterization, modeling, and evaluation of Upper Jurassic Smackover microbial carbonate and associated facies in Little Cedar Creek field, southwest Alabama, eastern Gulf coastal plain of the United States
Sharbel Al Haddad,1 Ernest A. Mancini2
1Department of Geology and Geophysics and Berg-Hughes Center for Petroleum and Sedimentary Systems, Texas AM University, College Station, Texas 77843, present address: ExxonMobil Exploration Company, Houston, Texas 77060; [email protected]
2Department of Geology and Geophysics and Berg-Hughes Center for Petroleum and Sedimentary Systems, Texas AM University, College Station, Texas 77843; [email protected]
ABSTRACT
An integrated field study of the microbial carbonate and associated reservoirs at Little Cedar Creek field in southwest Alabama, eastern Gulf coastal plain of the United States, provides an excellent opportunity to examine the spatial distribution of the sedimentary, petrophysical, and productivity trends in microbial reservoirs. This study includes characterizing the sedimentary, petrophysical, and hydrocarbon productivity characteristics of microbialites, developing a three-dimensional geologic reservoir model, and evaluating the hydrocarbon potential
of these reservoirs. The lower reservoir comprises subtidal thrombolitic boundstone associated with microbial buildups oriented in a southwest to northeast direction over an area that encompasses 32 mi2 (83 km2). These buildups developed in clusters in the western, central, and northern parts of the field and attained thicknesses of 43 ft (13 m). The clusters are separated by interbuildup areas of microbialites of 7–9 ft (2–3 m) in thickness that are overlain by a thick section of nonreservoir microbially influenced lime mudstone and wackestone. Porosity in the microbial reservoirs includes depositional constructed void (intraframe) and diagenetic solution-enhanced void and vuggy pore types. This pore system provides for high permeability and connectivity in the reservoir beds. Permeability ranges to as much as 7953 md and porosity to as much as 20%. The microbial boundstone beds have high
potential
as hydrocarbon flow units; however, the buildup areas are separated by interbuildup areas associated with a thick section of low-permeability to nonreservoir beds that serve as
potential
baffles or barriers to flow. Much of the 17.2 million bbl oil produced from the field is from the microbial lithofacies. The results from the Little Cedar Creek field study have application in the design of improved development strategies for other fields producing from microbial carbonate reservoirs.
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